12G 
EXPOSITION AT VIENNA. 
Takle showing the Pressure different BricJcs are capable of sustaining 
in various positions. 
Degree 
of Burning. 
Salmon, 
Salmon, . 
Salmon, . 
Light 
Stretcher, 
Hard, . 
Salmon, j 
Light 
Stretcher, 
Hard, 
Locality of 
Clay. 
Pea Shore, 
N. J. 
Philada. 
Neck. 
Process of 
Manufacture. 
C.B. & Co. 
Machine. 
By hand, 
Position— 
pressure. 
The material 
between which 
the brieks 
were placed. 
' End. 
Edge. 
Side. 
Edge. 
Side. 
Edge. 
Side. 
Side. 
Number of pounds 
pressure at which the 
brieks crushed. 
Ash wood. 
Cast iron. 
8,960= 4 tons. 
15,680= 7 tons. 
40,320=18 tons. 
13,440= 6 tons. 
134,400=60 tons, 
without crushing. 
11,200= 5 tons. 
33,600=15 tons. 
67,200=30 tons. 
The first four experiments were made with the brieks laid 
between hard ash planks, but the wood crushed and spread 
out, carrying the edges of the brieks with it, so that the pres 
sure at which they crushed may be considered far under the 
actual pressure the brieks are capable of sustaining. The 
last four experiments were made with the brieks between 
plates of cast-iron, without any cement, or anything between 
them, the rough, uneven surfaces comiug in contact; conse- 
quently, they were much more severe than though the brieks 
had been laid in cement, so as to allow the pressure to be 
evenly distributed over the whole surface. 
Display of Brick Machines at Former Exhip.ttions. 
At the Exhibition in Paris, 1867, several brick machines 
were shown, and were reported upon specially by M. Paul 
Bonueaville, Engineer of Arts and Manufactures, with draw- 
ings.* 
The London International Exhibition in 1871 was particu- 
larly rieh in all forrns of the potter’s art and appliances, and 
the brick and tile machinery of Europe was well shown. It 
is described in some detail by Peter Bawden, Esq.,| and also 
by Arthur Beckwith of New York. Salvetat and Ebelmen, 
* Etudes snr L’Exposition, Lacroix, VII., 350. 
t Official Reports (British) on the London International Exhibition, I., 345.